Java-Reading a file

import java.io.*;

public class ShowFile {

  public static void main(String args[]) throws IOException {

    if (args.length != 0) {

      File file = new File(args[0]);

      if (file.exists() && file.isFile()) {

        FileInputStream input_file =

                           new FileInputStream(file);

        /*FileInputStream input_file =

                     new FileInputStream(args[0]);*/

        int file_size = input_file.available();

        byte[] data = new byte[file_size];

        input_file.read(data);

        System.out.println(new String(data));

        input_file.close();

      } else {

        System.out.println("\"" + args[0] +

                           "\" not found !!!");

                }

    } else {

      System.out.println("Error in usage:");

      System.out.println(

                     "  Usage - java ShowFile ");

           }

  }

}